55 ns trr — the switching loss number that matters
The STTH6003CW from STMicroelectronics is a dual ultrafast rectifier rated 300 V reverse voltage with 30 A average forward current per diode in a common-cathode pair. The 55 ns reverse recovery time is the headline parameter: it keeps the switching energy per cycle low enough that a hard-switched converter can run without a snubber eating the efficiency gain. The TO-247-3 package handles the thermal load from both dice on a single heatsink pad.
Forward drop and thermal headroom
Forward voltage is 1.25 V max at 30 A per diode — that is the conduction loss floor for the rectifier stage. With a 175°C maximum junction temperature, the device can sustain the full 30 A in a hot ambient if the heatsink is sized correctly. The 60 µA reverse leakage at 300 V is a sanity check for the blocking state; it rises with temperature, so the thermal model should include leakage power at the hot junction.